/*
 *
 * Copyright (c) 2018, Alliance for Open Media. All rights reserved
 *
 * This source code is subject to the terms of the BSD 2 Clause License and
 * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
 * was not distributed with this source code in the LICENSE file, you can
 * obtain it at www.aomedia.org/license/software. If the Alliance for Open
 * Media Patent License 1.0 was not distributed with this source code in the
 * PATENTS file, you can obtain it at www.aomedia.org/license/patent.
 */

#include <assert.h>
#include <arm_neon.h>

#include "config/av1_rtcd.h"

#include "aom_dsp/aom_dsp_common.h"
#include "aom_ports/mem.h"
#include "av1/common/convolve.h"
#include "av1/common/filter.h"
#include "av1/common/arm/convolve_neon.h"
#include "av1/common/arm/mem_neon.h"
#include "av1/common/arm/transpose_neon.h"

static INLINE int16x4_t convolve8_4x4(const int16x4_t s0, const int16x4_t s1,
                                      const int16x4_t s2, const int16x4_t s3,
                                      const int16x4_t s4, const int16x4_t s5,
                                      const int16x4_t s6, const int16x4_t s7,
                                      const int16_t *filter) {
  int16x4_t sum;

  sum = vmul_n_s16(s0, filter[0]);
  sum = vmla_n_s16(sum, s1, filter[1]);
  sum = vmla_n_s16(sum, s2, filter[2]);
  sum = vmla_n_s16(sum, s5, filter[5]);
  sum = vmla_n_s16(sum, s6, filter[6]);
  sum = vmla_n_s16(sum, s7, filter[7]);
  /* filter[3] can take a max value of 128. So the max value of the result :
   * 128*255 + sum > 16 bits
   */
  sum = vqadd_s16(sum, vmul_n_s16(s3, filter[3]));
  sum = vqadd_s16(sum, vmul_n_s16(s4, filter[4]));

  return sum;
}

static INLINE uint8x8_t convolve8_horiz_8x8(
    const int16x8_t s0, const int16x8_t s1, const int16x8_t s2,
    const int16x8_t s3, const int16x8_t s4, const int16x8_t s5,
    const int16x8_t s6, const int16x8_t s7, const int16_t *filter,
    const int16x8_t shift_round_0, const int16x8_t shift_by_bits) {
  int16x8_t sum;

  sum = vmulq_n_s16(s0, filter[0]);
  sum = vmlaq_n_s16(sum, s1, filter[1]);
  sum = vmlaq_n_s16(sum, s2, filter[2]);
  sum = vmlaq_n_s16(sum, s5, filter[5]);
  sum = vmlaq_n_s16(sum, s6, filter[6]);
  sum = vmlaq_n_s16(sum, s7, filter[7]);
  /* filter[3] can take a max value of 128. So the max value of the result :
   * 128*255 + sum > 16 bits
   */
  sum = vqaddq_s16(sum, vmulq_n_s16(s3, filter[3]));
  sum = vqaddq_s16(sum, vmulq_n_s16(s4, filter[4]));

  sum = vqrshlq_s16(sum, shift_round_0);
  sum = vqrshlq_s16(sum, shift_by_bits);

  return vqmovun_s16(sum);
}

#if !defined(__aarch64__)
static INLINE uint8x8_t convolve8_horiz_4x1(
    const int16x4_t s0, const int16x4_t s1, const int16x4_t s2,
    const int16x4_t s3, const int16x4_t s4, const int16x4_t s5,
    const int16x4_t s6, const int16x4_t s7, const int16_t *filter,
    const int16x4_t shift_round_0, const int16x4_t shift_by_bits) {
  int16x4_t sum;

  sum = vmul_n_s16(s0, filter[0]);
  sum = vmla_n_s16(sum, s1, filter[1]);
  sum = vmla_n_s16(sum, s2, filter[2]);
  sum = vmla_n_s16(sum, s5, filter[5]);
  sum = vmla_n_s16(sum, s6, filter[6]);
  sum = vmla_n_s16(sum, s7, filter[7]);
  /* filter[3] can take a max value of 128. So the max value of the result :
   * 128*255 + sum > 16 bits
   */
  sum = vqadd_s16(sum, vmul_n_s16(s3, filter[3]));
  sum = vqadd_s16(sum, vmul_n_s16(s4, filter[4]));

  sum = vqrshl_s16(sum, shift_round_0);
  sum = vqrshl_s16(sum, shift_by_bits);

  return vqmovun_s16(vcombine_s16(sum, sum));
}
#endif  // !defined(__arch64__)

static INLINE uint8x8_t convolve8_vert_8x4(
    const int16x8_t s0, const int16x8_t s1, const int16x8_t s2,
    const int16x8_t s3, const int16x8_t s4, const int16x8_t s5,
    const int16x8_t s6, const int16x8_t s7, const int16_t *filter) {
  int16x8_t sum;

  sum = vmulq_n_s16(s0, filter[0]);
  sum = vmlaq_n_s16(sum, s1, filter[1]);
  sum = vmlaq_n_s16(sum, s2, filter[2]);
  sum = vmlaq_n_s16(sum, s5, filter[5]);
  sum = vmlaq_n_s16(sum, s6, filter[6]);
  sum = vmlaq_n_s16(sum, s7, filter[7]);
  /* filter[3] can take a max value of 128. So the max value of the result :
   * 128*255 + sum > 16 bits
   */
  sum = vqaddq_s16(sum, vmulq_n_s16(s3, filter[3]));
  sum = vqaddq_s16(sum, vmulq_n_s16(s4, filter[4]));

  return vqrshrun_n_s16(sum, FILTER_BITS);
}

static INLINE uint16x4_t convolve8_vert_4x4_s32(
    const int16x4_t s0, const int16x4_t s1, const int16x4_t s2,
    const int16x4_t s3, const int16x4_t s4, const int16x4_t s5,
    const int16x4_t s6, const int16x4_t s7, const int16_t *y_filter,
    const int32x4_t round_shift_vec, const int32x4_t offset_const,
    const int32x4_t sub_const_vec) {
  int32x4_t sum0;
  uint16x4_t res;
  const int32x4_t zero = vdupq_n_s32(0);

  sum0 = vmull_n_s16(s0, y_filter[0]);
  sum0 = vmlal_n_s16(sum0, s1, y_filter[1]);
  sum0 = vmlal_n_s16(sum0, s2, y_filter[2]);
  sum0 = vmlal_n_s16(sum0, s3, y_filter[3]);
  sum0 = vmlal_n_s16(sum0, s4, y_filter[4]);
  sum0 = vmlal_n_s16(sum0, s5, y_filter[5]);
  sum0 = vmlal_n_s16(sum0, s6, y_filter[6]);
  sum0 = vmlal_n_s16(sum0, s7, y_filter[7]);

  sum0 = vaddq_s32(sum0, offset_const);
  sum0 = vqrshlq_s32(sum0, round_shift_vec);
  sum0 = vsubq_s32(sum0, sub_const_vec);
  sum0 = vmaxq_s32(sum0, zero);

  res = vmovn_u32(vreinterpretq_u32_s32(sum0));

  return res;
}

static INLINE uint8x8_t convolve8_vert_8x4_s32(
    const int16x8_t s0, const int16x8_t s1, const int16x8_t s2,
    const int16x8_t s3, const int16x8_t s4, const int16x8_t s5,
    const int16x8_t s6, const int16x8_t s7, const int16_t *y_filter,
    const int32x4_t round_shift_vec, const int32x4_t offset_const,
    const int32x4_t sub_const_vec, const int16x8_t vec_round_bits) {
  int32x4_t sum0, sum1;
  uint16x8_t res;
  const int32x4_t zero = vdupq_n_s32(0);

  sum0 = vmull_n_s16(vget_low_s16(s0), y_filter[0]);
  sum0 = vmlal_n_s16(sum0, vget_low_s16(s1), y_filter[1]);
  sum0 = vmlal_n_s16(sum0, vget_low_s16(s2), y_filter[2]);
  sum0 = vmlal_n_s16(sum0, vget_low_s16(s3), y_filter[3]);
  sum0 = vmlal_n_s16(sum0, vget_low_s16(s4), y_filter[4]);
  sum0 = vmlal_n_s16(sum0, vget_low_s16(s5), y_filter[5]);
  sum0 = vmlal_n_s16(sum0, vget_low_s16(s6), y_filter[6]);
  sum0 = vmlal_n_s16(sum0, vget_low_s16(s7), y_filter[7]);

  sum1 = vmull_n_s16(vget_high_s16(s0), y_filter[0]);
  sum1 = vmlal_n_s16(sum1, vget_high_s16(s1), y_filter[1]);
  sum1 = vmlal_n_s16(sum1, vget_high_s16(s2), y_filter[2]);
  sum1 = vmlal_n_s16(sum1, vget_high_s16(s3), y_filter[3]);
  sum1 = vmlal_n_s16(sum1, vget_high_s16(s4), y_filter[4]);
  sum1 = vmlal_n_s16(sum1, vget_high_s16(s5), y_filter[5]);
  sum1 = vmlal_n_s16(sum1, vget_high_s16(s6), y_filter[6]);
  sum1 = vmlal_n_s16(sum1, vget_high_s16(s7), y_filter[7]);

  sum0 = vaddq_s32(sum0, offset_const);
  sum1 = vaddq_s32(sum1, offset_const);
  sum0 = vqrshlq_s32(sum0, round_shift_vec);
  sum1 = vqrshlq_s32(sum1, round_shift_vec);
  sum0 = vsubq_s32(sum0, sub_const_vec);
  sum1 = vsubq_s32(sum1, sub_const_vec);
  sum0 = vmaxq_s32(sum0, zero);
  sum1 = vmaxq_s32(sum1, zero);
  res = vcombine_u16(vqmovn_u32(vreinterpretq_u32_s32(sum0)),
                     vqmovn_u32(vreinterpretq_u32_s32(sum1)));

  res = vqrshlq_u16(res, vec_round_bits);

  return vqmovn_u16(res);
}

void av1_convolve_x_sr_neon(const uint8_t *src, int src_stride, uint8_t *dst,
                            int dst_stride, int w, int h,
                            const InterpFilterParams *filter_params_x,
                            const InterpFilterParams *filter_params_y,
                            const int subpel_x_qn, const int subpel_y_qn,
                            ConvolveParams *conv_params) {
  const uint8_t horiz_offset = filter_params_x->taps / 2 - 1;
  const int8_t bits = FILTER_BITS - conv_params->round_0;

  (void)subpel_y_qn;
  (void)conv_params;
  (void)filter_params_y;

  uint8x8_t t0;
#if defined(__aarch64__)
  uint8x8_t t1, t2, t3;
#endif

  assert(bits >= 0);
  assert((FILTER_BITS - conv_params->round_1) >= 0 ||
         ((conv_params->round_0 + conv_params->round_1) == 2 * FILTER_BITS));

  const int16_t *x_filter = av1_get_interp_filter_subpel_kernel(
      filter_params_x, subpel_x_qn & SUBPEL_MASK);

  const int16x8_t shift_round_0 = vdupq_n_s16(-conv_params->round_0);
  const int16x8_t shift_by_bits = vdupq_n_s16(-bits);

  src -= horiz_offset;
#if defined(__aarch64__)
  if (h == 4) {
    uint8x8_t d01, d23;
    int16x4_t s0, s1, s2, s3, s4, s5, s6, s7, s8, s9, s10, d0, d1, d2, d3;
    int16x8_t d01_temp, d23_temp;

    __builtin_prefetch(src + 0 * src_stride);
    __builtin_prefetch(src + 1 * src_stride);
    __builtin_prefetch(src + 2 * src_stride);
    __builtin_prefetch(src + 3 * src_stride);

    load_u8_8x4(src, src_stride, &t0, &t1, &t2, &t3);
    transpose_u8_8x4(&t0, &t1, &t2, &t3);

    s0 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));
    s1 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t1)));
    s2 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t2)));
    s3 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t3)));
    s4 = vget_high_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));
    s5 = vget_high_s16(vreinterpretq_s16_u16(vmovl_u8(t1)));
    s6 = vget_high_s16(vreinterpretq_s16_u16(vmovl_u8(t2)));
    __builtin_prefetch(dst + 0 * dst_stride);
    __builtin_prefetch(dst + 1 * dst_stride);
    __builtin_prefetch(dst + 2 * dst_stride);
    __builtin_prefetch(dst + 3 * dst_stride);
    src += 7;

    do {
      load_u8_8x4(src, src_stride, &t0, &t1, &t2, &t3);
      transpose_u8_8x4(&t0, &t1, &t2, &t3);

      s7 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));
      s8 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t1)));
      s9 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t2)));
      s10 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t3)));

      d0 = convolve8_4x4(s0, s1, s2, s3, s4, s5, s6, s7, x_filter);

      d1 = convolve8_4x4(s1, s2, s3, s4, s5, s6, s7, s8, x_filter);

      d2 = convolve8_4x4(s2, s3, s4, s5, s6, s7, s8, s9, x_filter);

      d3 = convolve8_4x4(s3, s4, s5, s6, s7, s8, s9, s10, x_filter);

      d01_temp = vqrshlq_s16(vcombine_s16(d0, d1), shift_round_0);
      d23_temp = vqrshlq_s16(vcombine_s16(d2, d3), shift_round_0);

      d01_temp = vqrshlq_s16(d01_temp, shift_by_bits);
      d23_temp = vqrshlq_s16(d23_temp, shift_by_bits);

      d01 = vqmovun_s16(d01_temp);
      d23 = vqmovun_s16(d23_temp);

      transpose_u8_4x4(&d01, &d23);

      if (w != 2) {
        vst1_lane_u32((uint32_t *)(dst + 0 * dst_stride),  // 00 01 02 03
                      vreinterpret_u32_u8(d01), 0);
        vst1_lane_u32((uint32_t *)(dst + 1 * dst_stride),  // 10 11 12 13
                      vreinterpret_u32_u8(d23), 0);
        vst1_lane_u32((uint32_t *)(dst + 2 * dst_stride),  // 20 21 22 23
                      vreinterpret_u32_u8(d01), 1);
        vst1_lane_u32((uint32_t *)(dst + 3 * dst_stride),  // 30 31 32 33
                      vreinterpret_u32_u8(d23), 1);
      } else {
        vst1_lane_u16((uint16_t *)(dst + 0 * dst_stride),  // 00 01
                      vreinterpret_u16_u8(d01), 0);
        vst1_lane_u16((uint16_t *)(dst + 1 * dst_stride),  // 10 11
                      vreinterpret_u16_u8(d23), 0);
        vst1_lane_u16((uint16_t *)(dst + 2 * dst_stride),  // 20 21
                      vreinterpret_u16_u8(d01), 2);
        vst1_lane_u16((uint16_t *)(dst + 3 * dst_stride),  // 30 31
                      vreinterpret_u16_u8(d23), 2);
      }

      s0 = s4;
      s1 = s5;
      s2 = s6;
      s3 = s7;
      s4 = s8;
      s5 = s9;
      s6 = s10;
      src += 4;
      dst += 4;
      w -= 4;
    } while (w > 0);
  } else {
#endif
    int width;
    const uint8_t *s;
    int16x8_t s0, s1, s2, s3, s4, s5, s6, s7;

#if defined(__aarch64__)
    int16x8_t s8, s9, s10;
    uint8x8_t t4, t5, t6, t7;
#endif

    if (w <= 4) {
#if defined(__aarch64__)
      do {
        load_u8_8x8(src, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
        transpose_u8_8x8(&t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
        s0 = vreinterpretq_s16_u16(vmovl_u8(t0));
        s1 = vreinterpretq_s16_u16(vmovl_u8(t1));
        s2 = vreinterpretq_s16_u16(vmovl_u8(t2));
        s3 = vreinterpretq_s16_u16(vmovl_u8(t3));
        s4 = vreinterpretq_s16_u16(vmovl_u8(t4));
        s5 = vreinterpretq_s16_u16(vmovl_u8(t5));
        s6 = vreinterpretq_s16_u16(vmovl_u8(t6));

        load_u8_8x8(src + 7, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6,
                    &t7);
        src += 8 * src_stride;
        __builtin_prefetch(dst + 0 * dst_stride);
        __builtin_prefetch(dst + 1 * dst_stride);
        __builtin_prefetch(dst + 2 * dst_stride);
        __builtin_prefetch(dst + 3 * dst_stride);
        __builtin_prefetch(dst + 4 * dst_stride);
        __builtin_prefetch(dst + 5 * dst_stride);
        __builtin_prefetch(dst + 6 * dst_stride);
        __builtin_prefetch(dst + 7 * dst_stride);

        transpose_u8_4x8(&t0, &t1, &t2, &t3, t4, t5, t6, t7);

        s7 = vreinterpretq_s16_u16(vmovl_u8(t0));
        s8 = vreinterpretq_s16_u16(vmovl_u8(t1));
        s9 = vreinterpretq_s16_u16(vmovl_u8(t2));
        s10 = vreinterpretq_s16_u16(vmovl_u8(t3));

        __builtin_prefetch(src + 0 * src_stride);
        __builtin_prefetch(src + 1 * src_stride);
        __builtin_prefetch(src + 2 * src_stride);
        __builtin_prefetch(src + 3 * src_stride);
        __builtin_prefetch(src + 4 * src_stride);
        __builtin_prefetch(src + 5 * src_stride);
        __builtin_prefetch(src + 6 * src_stride);
        __builtin_prefetch(src + 7 * src_stride);
        t0 = convolve8_horiz_8x8(s0, s1, s2, s3, s4, s5, s6, s7, x_filter,
                                 shift_round_0, shift_by_bits);
        t1 = convolve8_horiz_8x8(s1, s2, s3, s4, s5, s6, s7, s8, x_filter,
                                 shift_round_0, shift_by_bits);
        t2 = convolve8_horiz_8x8(s2, s3, s4, s5, s6, s7, s8, s9, x_filter,
                                 shift_round_0, shift_by_bits);
        t3 = convolve8_horiz_8x8(s3, s4, s5, s6, s7, s8, s9, s10, x_filter,
                                 shift_round_0, shift_by_bits);

        transpose_u8_8x4(&t0, &t1, &t2, &t3);

        if ((w == 4) && (h > 4)) {
          vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(t0),
                        0);  // 00 01 02 03
          dst += dst_stride;
          vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(t1),
                        0);  // 10 11 12 13
          dst += dst_stride;
          vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(t2),
                        0);  // 20 21 22 23
          dst += dst_stride;
          vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(t3),
                        0);  // 30 31 32 33
          dst += dst_stride;
          vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(t0),
                        1);  // 40 41 42 43
          dst += dst_stride;
          vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(t1),
                        1);  // 50 51 52 53
          dst += dst_stride;
          vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(t2),
                        1);  // 60 61 62 63
          dst += dst_stride;
          vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(t3),
                        1);  // 70 71 72 73
          dst += dst_stride;
        } else if ((w == 4) && (h == 2)) {
          vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(t0),
                        0);  // 00 01 02 03
          dst += dst_stride;
          vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(t1),
                        0);  // 10 11 12 13
          dst += dst_stride;
        } else if ((w == 2) && (h > 4)) {
          vst1_lane_u16((uint16_t *)dst, vreinterpret_u16_u8(t0), 0);  // 00 01
          dst += dst_stride;
          vst1_lane_u16((uint16_t *)dst, vreinterpret_u16_u8(t1), 0);  // 10 11
          dst += dst_stride;
          vst1_lane_u16((uint16_t *)dst, vreinterpret_u16_u8(t2), 0);  // 20 21
          dst += dst_stride;
          vst1_lane_u16((uint16_t *)dst, vreinterpret_u16_u8(t3), 0);  // 30 31
          dst += dst_stride;
          vst1_lane_u16((uint16_t *)dst, vreinterpret_u16_u8(t0), 2);  // 40 41
          dst += dst_stride;
          vst1_lane_u16((uint16_t *)dst, vreinterpret_u16_u8(t1), 2);  // 50 51
          dst += dst_stride;
          vst1_lane_u16((uint16_t *)dst, vreinterpret_u16_u8(t2), 2);  // 60 61
          dst += dst_stride;
          vst1_lane_u16((uint16_t *)dst, vreinterpret_u16_u8(t3), 2);  // 70 71
          dst += dst_stride;
        } else if ((w == 2) && (h == 2)) {
          vst1_lane_u16((uint16_t *)dst, vreinterpret_u16_u8(t0), 0);  // 00 01
          dst += dst_stride;
          vst1_lane_u16((uint16_t *)dst, vreinterpret_u16_u8(t1), 0);  // 10 11
          dst += dst_stride;
        }
        h -= 8;
      } while (h > 0);
#else
    int16x8_t tt0;
    int16x4_t x0, x1, x2, x3, x4, x5, x6, x7;
    const int16x4_t shift_round_0_low = vget_low_s16(shift_round_0);
    const int16x4_t shift_by_bits_low = vget_low_s16(shift_by_bits);
    do {
      t0 = vld1_u8(src);  // a0 a1 a2 a3 a4 a5 a6 a7
      tt0 = vreinterpretq_s16_u16(vmovl_u8(t0));
      x0 = vget_low_s16(tt0);   // a0 a1 a2 a3
      x4 = vget_high_s16(tt0);  // a4 a5 a6 a7

      t0 = vld1_u8(src + 8);  // a8 a9 a10 a11 a12 a13 a14 a15
      tt0 = vreinterpretq_s16_u16(vmovl_u8(t0));
      x7 = vget_low_s16(tt0);  // a8 a9 a10 a11

      x1 = vext_s16(x0, x4, 1);  // a1 a2 a3 a4
      x2 = vext_s16(x0, x4, 2);  // a2 a3 a4 a5
      x3 = vext_s16(x0, x4, 3);  // a3 a4 a5 a6
      x5 = vext_s16(x4, x7, 1);  // a5 a6 a7 a8
      x6 = vext_s16(x4, x7, 2);  // a6 a7 a8 a9
      x7 = vext_s16(x4, x7, 3);  // a7 a8 a9 a10

      src += src_stride;

      t0 = convolve8_horiz_4x1(x0, x1, x2, x3, x4, x5, x6, x7, x_filter,
                               shift_round_0_low, shift_by_bits_low);

      if (w == 4) {
        vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(t0),
                      0);  // 00 01 02 03
        dst += dst_stride;
      } else if (w == 2) {
        vst1_lane_u16((uint16_t *)dst, vreinterpret_u16_u8(t0), 0);  // 00 01
        dst += dst_stride;
      }
      h -= 1;
    } while (h > 0);
#endif
    } else {
      uint8_t *d;
      int16x8_t s11;
#if defined(__aarch64__)
      int16x8_t s12, s13, s14;
      do {
        __builtin_prefetch(src + 0 * src_stride);
        __builtin_prefetch(src + 1 * src_stride);
        __builtin_prefetch(src + 2 * src_stride);
        __builtin_prefetch(src + 3 * src_stride);
        __builtin_prefetch(src + 4 * src_stride);
        __builtin_prefetch(src + 5 * src_stride);
        __builtin_prefetch(src + 6 * src_stride);
        __builtin_prefetch(src + 7 * src_stride);
        load_u8_8x8(src, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
        transpose_u8_8x8(&t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
        s0 = vreinterpretq_s16_u16(vmovl_u8(t0));
        s1 = vreinterpretq_s16_u16(vmovl_u8(t1));
        s2 = vreinterpretq_s16_u16(vmovl_u8(t2));
        s3 = vreinterpretq_s16_u16(vmovl_u8(t3));
        s4 = vreinterpretq_s16_u16(vmovl_u8(t4));
        s5 = vreinterpretq_s16_u16(vmovl_u8(t5));
        s6 = vreinterpretq_s16_u16(vmovl_u8(t6));

        width = w;
        s = src + 7;
        d = dst;
        __builtin_prefetch(dst + 0 * dst_stride);
        __builtin_prefetch(dst + 1 * dst_stride);
        __builtin_prefetch(dst + 2 * dst_stride);
        __builtin_prefetch(dst + 3 * dst_stride);
        __builtin_prefetch(dst + 4 * dst_stride);
        __builtin_prefetch(dst + 5 * dst_stride);
        __builtin_prefetch(dst + 6 * dst_stride);
        __builtin_prefetch(dst + 7 * dst_stride);

        do {
          load_u8_8x8(s, src_stride, &t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
          transpose_u8_8x8(&t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
          s7 = vreinterpretq_s16_u16(vmovl_u8(t0));
          s8 = vreinterpretq_s16_u16(vmovl_u8(t1));
          s9 = vreinterpretq_s16_u16(vmovl_u8(t2));
          s10 = vreinterpretq_s16_u16(vmovl_u8(t3));
          s11 = vreinterpretq_s16_u16(vmovl_u8(t4));
          s12 = vreinterpretq_s16_u16(vmovl_u8(t5));
          s13 = vreinterpretq_s16_u16(vmovl_u8(t6));
          s14 = vreinterpretq_s16_u16(vmovl_u8(t7));

          t0 = convolve8_horiz_8x8(s0, s1, s2, s3, s4, s5, s6, s7, x_filter,
                                   shift_round_0, shift_by_bits);

          t1 = convolve8_horiz_8x8(s1, s2, s3, s4, s5, s6, s7, s8, x_filter,
                                   shift_round_0, shift_by_bits);

          t2 = convolve8_horiz_8x8(s2, s3, s4, s5, s6, s7, s8, s9, x_filter,
                                   shift_round_0, shift_by_bits);

          t3 = convolve8_horiz_8x8(s3, s4, s5, s6, s7, s8, s9, s10, x_filter,
                                   shift_round_0, shift_by_bits);

          t4 = convolve8_horiz_8x8(s4, s5, s6, s7, s8, s9, s10, s11, x_filter,
                                   shift_round_0, shift_by_bits);

          t5 = convolve8_horiz_8x8(s5, s6, s7, s8, s9, s10, s11, s12, x_filter,
                                   shift_round_0, shift_by_bits);

          t6 = convolve8_horiz_8x8(s6, s7, s8, s9, s10, s11, s12, s13, x_filter,
                                   shift_round_0, shift_by_bits);

          t7 = convolve8_horiz_8x8(s7, s8, s9, s10, s11, s12, s13, s14,
                                   x_filter, shift_round_0, shift_by_bits);

          transpose_u8_8x8(&t0, &t1, &t2, &t3, &t4, &t5, &t6, &t7);
          if (h != 2) {
            store_u8_8x8(d, dst_stride, t0, t1, t2, t3, t4, t5, t6, t7);
          } else {
            store_row2_u8_8x8(d, dst_stride, t0, t1);
          }
          s0 = s8;
          s1 = s9;
          s2 = s10;
          s3 = s11;
          s4 = s12;
          s5 = s13;
          s6 = s14;
          s += 8;
          d += 8;
          width -= 8;
        } while (width > 0);
        src += 8 * src_stride;
        dst += 8 * dst_stride;
        h -= 8;
      } while (h > 0);
#else
    do {
      t0 = vld1_u8(src);  // a0 a1 a2 a3 a4 a5 a6 a7
      s0 = vreinterpretq_s16_u16(vmovl_u8(t0));

      width = w;
      s = src + 8;
      d = dst;
      __builtin_prefetch(dst);

      do {
        t0 = vld1_u8(s);  // a8 a9 a10 a11 a12 a13 a14 a15
        s7 = vreinterpretq_s16_u16(vmovl_u8(t0));
        s11 = s0;
        s0 = s7;

        s1 = vextq_s16(s11, s7, 1);  // a1 a2 a3 a4 a5 a6 a7 a8
        s2 = vextq_s16(s11, s7, 2);  // a2 a3 a4 a5 a6 a7 a8 a9
        s3 = vextq_s16(s11, s7, 3);  // a3 a4 a5 a6 a7 a8 a9 a10
        s4 = vextq_s16(s11, s7, 4);  // a4 a5 a6 a7 a8 a9 a10 a11
        s5 = vextq_s16(s11, s7, 5);  // a5 a6 a7 a8 a9 a10 a11 a12
        s6 = vextq_s16(s11, s7, 6);  // a6 a7 a8 a9 a10 a11 a12 a13
        s7 = vextq_s16(s11, s7, 7);  // a7 a8 a9 a10 a11 a12 a13 a14

        t0 = convolve8_horiz_8x8(s11, s1, s2, s3, s4, s5, s6, s7, x_filter,
                                 shift_round_0, shift_by_bits);
        vst1_u8(d, t0);

        s += 8;
        d += 8;
        width -= 8;
      } while (width > 0);
      src += src_stride;
      dst += dst_stride;
      h -= 1;
    } while (h > 0);
#endif
    }
#if defined(__aarch64__)
  }
#endif
}

void av1_convolve_y_sr_neon(const uint8_t *src, int src_stride, uint8_t *dst,
                            int dst_stride, int w, int h,
                            const InterpFilterParams *filter_params_x,
                            const InterpFilterParams *filter_params_y,
                            const int subpel_x_qn, const int subpel_y_qn,
                            ConvolveParams *conv_params) {
  const int vert_offset = filter_params_y->taps / 2 - 1;

  src -= vert_offset * src_stride;

  (void)filter_params_x;
  (void)subpel_x_qn;
  (void)conv_params;

  assert(conv_params->round_0 <= FILTER_BITS);
  assert(((conv_params->round_0 + conv_params->round_1) <= (FILTER_BITS + 1)) ||
         ((conv_params->round_0 + conv_params->round_1) == (2 * FILTER_BITS)));

  const int16_t *y_filter = av1_get_interp_filter_subpel_kernel(
      filter_params_y, subpel_y_qn & SUBPEL_MASK);

  if (w <= 4) {
    uint8x8_t d01;
    int16x4_t s0, s1, s2, s3, s4, s5, s6, s7, d0;
#if defined(__aarch64__)
    uint8x8_t d23;
    int16x4_t s8, s9, s10, d1, d2, d3;
#endif
    s0 = vreinterpret_s16_u16(vget_low_u16(vmovl_u8(vld1_u8(src))));
    src += src_stride;
    s1 = vreinterpret_s16_u16(vget_low_u16(vmovl_u8(vld1_u8(src))));
    src += src_stride;
    s2 = vreinterpret_s16_u16(vget_low_u16(vmovl_u8(vld1_u8(src))));
    src += src_stride;
    s3 = vreinterpret_s16_u16(vget_low_u16(vmovl_u8(vld1_u8(src))));
    src += src_stride;
    s4 = vreinterpret_s16_u16(vget_low_u16(vmovl_u8(vld1_u8(src))));
    src += src_stride;
    s5 = vreinterpret_s16_u16(vget_low_u16(vmovl_u8(vld1_u8(src))));
    src += src_stride;
    s6 = vreinterpret_s16_u16(vget_low_u16(vmovl_u8(vld1_u8(src))));
    src += src_stride;

    do {
      s7 = vreinterpret_s16_u16(vget_low_u16(vmovl_u8(vld1_u8(src))));
      src += src_stride;
#if defined(__aarch64__)
      s8 = vreinterpret_s16_u16(vget_low_u16(vmovl_u8(vld1_u8(src))));
      src += src_stride;
      s9 = vreinterpret_s16_u16(vget_low_u16(vmovl_u8(vld1_u8(src))));
      src += src_stride;
      s10 = vreinterpret_s16_u16(vget_low_u16(vmovl_u8(vld1_u8(src))));
      src += src_stride;

      __builtin_prefetch(dst + 0 * dst_stride);
      __builtin_prefetch(dst + 1 * dst_stride);
      __builtin_prefetch(dst + 2 * dst_stride);
      __builtin_prefetch(dst + 3 * dst_stride);
      __builtin_prefetch(src + 0 * src_stride);
      __builtin_prefetch(src + 1 * src_stride);
      __builtin_prefetch(src + 2 * src_stride);
      __builtin_prefetch(src + 3 * src_stride);
      d0 = convolve8_4x4(s0, s1, s2, s3, s4, s5, s6, s7, y_filter);
      d1 = convolve8_4x4(s1, s2, s3, s4, s5, s6, s7, s8, y_filter);
      d2 = convolve8_4x4(s2, s3, s4, s5, s6, s7, s8, s9, y_filter);
      d3 = convolve8_4x4(s3, s4, s5, s6, s7, s8, s9, s10, y_filter);

      d01 = vqrshrun_n_s16(vcombine_s16(d0, d1), FILTER_BITS);
      d23 = vqrshrun_n_s16(vcombine_s16(d2, d3), FILTER_BITS);
      if ((w == 4) && (h != 2)) {
        vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(d01),
                      0);  // 00 01 02 03
        dst += dst_stride;
        vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(d01),
                      1);  // 10 11 12 13
        dst += dst_stride;
        vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(d23),
                      0);  // 20 21 22 23
        dst += dst_stride;
        vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(d23),
                      1);  // 30 31 32 33
        dst += dst_stride;
      } else if ((w == 4) && (h == 2)) {
        vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(d01),
                      0);  // 00 01 02 03
        dst += dst_stride;
        vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(d01),
                      1);  // 10 11 12 13
        dst += dst_stride;
      } else if ((w == 2) && (h != 2)) {
        vst1_lane_u16((uint16_t *)dst, vreinterpret_u16_u8(d01), 0);  // 00 01
        dst += dst_stride;
        vst1_lane_u16((uint16_t *)dst, vreinterpret_u16_u8(d01), 2);  // 10 11
        dst += dst_stride;
        vst1_lane_u16((uint16_t *)dst, vreinterpret_u16_u8(d23), 0);  // 20 21
        dst += dst_stride;
        vst1_lane_u16((uint16_t *)dst, vreinterpret_u16_u8(d23), 2);  // 30 31
        dst += dst_stride;
      } else if ((w == 2) && (h == 2)) {
        vst1_lane_u16((uint16_t *)dst, vreinterpret_u16_u8(d01), 0);  // 00 01
        dst += dst_stride;
        vst1_lane_u16((uint16_t *)dst, vreinterpret_u16_u8(d01), 2);  // 10 11
        dst += dst_stride;
      }
      s0 = s4;
      s1 = s5;
      s2 = s6;
      s3 = s7;
      s4 = s8;
      s5 = s9;
      s6 = s10;
      h -= 4;
#else
      __builtin_prefetch(dst + 0 * dst_stride);
      __builtin_prefetch(src + 0 * src_stride);

      d0 = convolve8_4x4(s0, s1, s2, s3, s4, s5, s6, s7, y_filter);

      d01 = vqrshrun_n_s16(vcombine_s16(d0, d0), FILTER_BITS);

      if (w == 4) {
        vst1_lane_u32((uint32_t *)dst, vreinterpret_u32_u8(d01), 0);
        dst += dst_stride;
      } else if (w == 2) {
        vst1_lane_u16((uint16_t *)dst, vreinterpret_u16_u8(d01), 0);
        dst += dst_stride;
      }
      s0 = s1;
      s1 = s2;
      s2 = s3;
      s3 = s4;
      s4 = s5;
      s5 = s6;
      s6 = s7;
      h -= 1;
#endif
    } while (h > 0);
  } else {
    int height;
    const uint8_t *s;
    uint8_t *d;
    uint8x8_t t0;
    int16x8_t s0, s1, s2, s3, s4, s5, s6, s7;
#if defined(__aarch64__)
    uint8x8_t t1, t2, t3;
    int16x8_t s8, s9, s10;
#endif
    do {
      __builtin_prefetch(src + 0 * src_stride);
      __builtin_prefetch(src + 1 * src_stride);
      __builtin_prefetch(src + 2 * src_stride);
      __builtin_prefetch(src + 3 * src_stride);
      __builtin_prefetch(src + 4 * src_stride);
      __builtin_prefetch(src + 5 * src_stride);
      __builtin_prefetch(src + 6 * src_stride);
      s = src;
      s0 = vreinterpretq_s16_u16(vmovl_u8(vld1_u8(s)));
      s += src_stride;
      s1 = vreinterpretq_s16_u16(vmovl_u8(vld1_u8(s)));
      s += src_stride;
      s2 = vreinterpretq_s16_u16(vmovl_u8(vld1_u8(s)));
      s += src_stride;
      s3 = vreinterpretq_s16_u16(vmovl_u8(vld1_u8(s)));
      s += src_stride;
      s4 = vreinterpretq_s16_u16(vmovl_u8(vld1_u8(s)));
      s += src_stride;
      s5 = vreinterpretq_s16_u16(vmovl_u8(vld1_u8(s)));
      s += src_stride;
      s6 = vreinterpretq_s16_u16(vmovl_u8(vld1_u8(s)));
      s += src_stride;
      d = dst;
      height = h;

      do {
        s7 = vreinterpretq_s16_u16(vmovl_u8(vld1_u8(s)));
        s += src_stride;
#if defined(__aarch64__)
        s8 = vreinterpretq_s16_u16(vmovl_u8(vld1_u8(s)));
        s += src_stride;
        s9 = vreinterpretq_s16_u16(vmovl_u8(vld1_u8(s)));
        s += src_stride;
        s10 = vreinterpretq_s16_u16(vmovl_u8(vld1_u8(s)));
        s += src_stride;

        __builtin_prefetch(d + 0 * dst_stride);
        __builtin_prefetch(d + 1 * dst_stride);
        __builtin_prefetch(d + 2 * dst_stride);
        __builtin_prefetch(d + 3 * dst_stride);
        __builtin_prefetch(s + 0 * src_stride);
        __builtin_prefetch(s + 1 * src_stride);
        __builtin_prefetch(s + 2 * src_stride);
        __builtin_prefetch(s + 3 * src_stride);
        t0 = convolve8_vert_8x4(s0, s1, s2, s3, s4, s5, s6, s7, y_filter);
        t1 = convolve8_vert_8x4(s1, s2, s3, s4, s5, s6, s7, s8, y_filter);
        t2 = convolve8_vert_8x4(s2, s3, s4, s5, s6, s7, s8, s9, y_filter);
        t3 = convolve8_vert_8x4(s3, s4, s5, s6, s7, s8, s9, s10, y_filter);
        if (h != 2) {
          vst1_u8(d, t0);
          d += dst_stride;
          vst1_u8(d, t1);
          d += dst_stride;
          vst1_u8(d, t2);
          d += dst_stride;
          vst1_u8(d, t3);
          d += dst_stride;
        } else {
          vst1_u8(d, t0);
          d += dst_stride;
          vst1_u8(d, t1);
          d += dst_stride;
        }
        s0 = s4;
        s1 = s5;
        s2 = s6;
        s3 = s7;
        s4 = s8;
        s5 = s9;
        s6 = s10;
        height -= 4;
#else
        __builtin_prefetch(d);
        __builtin_prefetch(s);

        t0 = convolve8_vert_8x4(s0, s1, s2, s3, s4, s5, s6, s7, y_filter);

        vst1_u8(d, t0);
        d += dst_stride;

        s0 = s1;
        s1 = s2;
        s2 = s3;
        s3 = s4;
        s4 = s5;
        s5 = s6;
        s6 = s7;
        height -= 1;
#endif
      } while (height > 0);
      src += 8;
      dst += 8;
      w -= 8;
    } while (w > 0);
  }
}

void av1_convolve_2d_sr_neon(const uint8_t *src, int src_stride, uint8_t *dst,
                             int dst_stride, int w, int h,
                             const InterpFilterParams *filter_params_x,
                             const InterpFilterParams *filter_params_y,
                             const int subpel_x_qn, const int subpel_y_qn,
                             ConvolveParams *conv_params) {
  int im_dst_stride;
  int width, height;
  uint8x8_t t0;

  DECLARE_ALIGNED(16, int16_t,
                  im_block[(MAX_SB_SIZE + HORIZ_EXTRA_ROWS) * MAX_SB_SIZE]);

  const int bd = 8;
  const int im_h = h + filter_params_y->taps - 1;
  const int im_stride = MAX_SB_SIZE;
  const int vert_offset = filter_params_y->taps / 2 - 1;
  const int horiz_offset = filter_params_x->taps / 2 - 1;

  const uint8_t *src_ptr = src - vert_offset * src_stride - horiz_offset;
  const uint8_t *s;
  int16_t *dst_ptr;

  dst_ptr = im_block;
  im_dst_stride = im_stride;
  height = im_h;
  width = w;

  const int16_t round_bits =
      FILTER_BITS * 2 - conv_params->round_0 - conv_params->round_1;
  const int16x8_t vec_round_bits = vdupq_n_s16(-round_bits);
  const int offset_bits = bd + 2 * FILTER_BITS - conv_params->round_0;
  const int16_t *x_filter = av1_get_interp_filter_subpel_kernel(
      filter_params_x, subpel_x_qn & SUBPEL_MASK);

  int16_t x_filter_tmp[8];
  int16x8_t filter_x_coef = vld1q_s16(x_filter);

  // filter coeffs are even, so downshifting by 1 to reduce intermediate
  // precision requirements.
  filter_x_coef = vshrq_n_s16(filter_x_coef, 1);
  vst1q_s16(&x_filter_tmp[0], filter_x_coef);

  assert(conv_params->round_0 > 0);

  if (w <= 4) {
    int16x4_t s0, s1, s2, s3, s4, s5, s6, s7, d0;

    const int16x4_t horiz_const = vdup_n_s16((1 << (bd + FILTER_BITS - 2)));
    const int16x4_t shift_round_0 = vdup_n_s16(-(conv_params->round_0 - 1));

    do {
      s = src_ptr;

      int16x8_t tt0;

      __builtin_prefetch(s);

      t0 = vld1_u8(s);  // a0 a1 a2 a3 a4 a5 a6 a7
      tt0 = vreinterpretq_s16_u16(vmovl_u8(t0));
      s0 = vget_low_s16(tt0);
      s4 = vget_high_s16(tt0);

      __builtin_prefetch(dst_ptr);
      s += 8;

      t0 = vld1_u8(s);  // a8 a9 a10 a11 a12 a13 a14 a15
      s7 = vget_low_s16(vreinterpretq_s16_u16(vmovl_u8(t0)));

      s1 = vext_s16(s0, s4, 1);  // a1 a2 a3 a4
      s2 = vext_s16(s0, s4, 2);  // a2 a3 a4 a5
      s3 = vext_s16(s0, s4, 3);  // a3 a4 a5 a6
      s5 = vext_s16(s4, s7, 1);  // a5 a6 a7 a8
      s6 = vext_s16(s4, s7, 2);  // a6 a7 a8 a9
      s7 = vext_s16(s4, s7, 3);  // a7 a8 a9 a10

      d0 = convolve8_4x4_s16(s0, s1, s2, s3, s4, s5, s6, s7, x_filter_tmp,
                             horiz_const, shift_round_0);

      if (w == 4) {
        vst1_s16(dst_ptr, d0);
        dst_ptr += im_dst_stride;
      } else if (w == 2) {
        vst1_lane_u32((uint32_t *)dst_ptr, vreinterpret_u32_s16(d0), 0);
        dst_ptr += im_dst_stride;
      }

      src_ptr += src_stride;
      height -= 1;
    } while (height > 0);
  } else {
    int16_t *d_tmp;
    int16x8_t s0, s1, s2, s3, s4, s5, s6, s7, res0;

    const int16x8_t horiz_const = vdupq_n_s16((1 << (bd + FILTER_BITS - 2)));
    const int16x8_t shift_round_0 = vdupq_n_s16(-(conv_params->round_0 - 1));

    do {
      t0 = vld1_u8(src_ptr);
      s0 = vreinterpretq_s16_u16(vmovl_u8(t0));  // a0 a1 a2 a3 a4 a5 a6 a7

      width = w;
      s = src_ptr + 8;
      d_tmp = dst_ptr;

      __builtin_prefetch(dst_ptr);

      do {
        t0 = vld1_u8(s);  // a8 a9 a10 a11 a12 a13 a14 a15
        s7 = vreinterpretq_s16_u16(vmovl_u8(t0));
        int16x8_t sum = s0;
        s0 = s7;

        s1 = vextq_s16(sum, s7, 1);  // a1 a2 a3 a4 a5 a6 a7 a8
        s2 = vextq_s16(sum, s7, 2);  // a2 a3 a4 a5 a6 a7 a8 a9
        s3 = vextq_s16(sum, s7, 3);  // a3 a4 a5 a6 a7 a8 a9 a10
        s4 = vextq_s16(sum, s7, 4);  // a4 a5 a6 a7 a8 a9 a10 a11
        s5 = vextq_s16(sum, s7, 5);  // a5 a6 a7 a8 a9 a10 a11 a12
        s6 = vextq_s16(sum, s7, 6);  // a6 a7 a8 a9 a10 a11 a12 a13
        s7 = vextq_s16(sum, s7, 7);  // a7 a8 a9 a10 a11 a12 a13 a14

        res0 = convolve8_8x8_s16(sum, s1, s2, s3, s4, s5, s6, s7, x_filter_tmp,
                                 horiz_const, shift_round_0);

        vst1q_s16(d_tmp, res0);

        s += 8;
        d_tmp += 8;
        width -= 8;
      } while (width > 0);
      src_ptr += src_stride;
      dst_ptr += im_dst_stride;
      height -= 1;
    } while (height > 0);
  }

  // vertical
  {
    uint8_t *dst_u8_ptr, *d_u8;
    int16_t *v_src_ptr, *v_s;

    const int32_t sub_const = (1 << (offset_bits - conv_params->round_1)) +
                              (1 << (offset_bits - conv_params->round_1 - 1));
    const int16_t *y_filter = av1_get_interp_filter_subpel_kernel(
        filter_params_y, subpel_y_qn & SUBPEL_MASK);

    const int32x4_t round_shift_vec = vdupq_n_s32(-(conv_params->round_1));
    const int32x4_t offset_const = vdupq_n_s32(1 << offset_bits);
    const int32x4_t sub_const_vec = vdupq_n_s32(sub_const);

    src_stride = im_stride;
    v_src_ptr = im_block;
    dst_u8_ptr = dst;

    height = h;
    width = w;

    if (width <= 4) {
      int16x4_t s0, s1, s2, s3, s4, s5, s6, s7;
      uint16x4_t d0;
      uint16x8_t dd0;
      uint8x8_t d01;

      d_u8 = dst_u8_ptr;
      v_s = v_src_ptr;

      __builtin_prefetch(v_s + 0 * im_stride);
      __builtin_prefetch(v_s + 1 * im_stride);
      __builtin_prefetch(v_s + 2 * im_stride);
      __builtin_prefetch(v_s + 3 * im_stride);
      __builtin_prefetch(v_s + 4 * im_stride);
      __builtin_prefetch(v_s + 5 * im_stride);
      __builtin_prefetch(v_s + 6 * im_stride);
      __builtin_prefetch(v_s + 7 * im_stride);

      load_s16_4x8(v_s, im_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6, &s7);
      v_s += (7 * im_stride);

      do {
        s7 = vld1_s16(v_s);
        v_s += im_stride;

        __builtin_prefetch(d_u8 + 0 * dst_stride);

        d0 = convolve8_vert_4x4_s32(s0, s1, s2, s3, s4, s5, s6, s7, y_filter,
                                    round_shift_vec, offset_const,
                                    sub_const_vec);

        dd0 = vqrshlq_u16(vcombine_u16(d0, d0), vec_round_bits);
        d01 = vqmovn_u16(dd0);

        if (w == 4) {
          vst1_lane_u32((uint32_t *)d_u8, vreinterpret_u32_u8(d01),
                        0);  // 00 01 02 03
          d_u8 += dst_stride;

        } else if (w == 2) {
          vst1_lane_u16((uint16_t *)d_u8, vreinterpret_u16_u8(d01),
                        0);  // 00 01
          d_u8 += dst_stride;
        }

        s0 = s1;
        s1 = s2;
        s2 = s3;
        s3 = s4;
        s4 = s5;
        s5 = s6;
        s6 = s7;
        height -= 1;
      } while (height > 0);
    } else {
      // if width is a multiple of 8 & height is a multiple of 4
      int16x8_t s0, s1, s2, s3, s4, s5, s6, s7;
      uint8x8_t res0;

      do {
        __builtin_prefetch(v_src_ptr + 0 * im_stride);
        __builtin_prefetch(v_src_ptr + 1 * im_stride);
        __builtin_prefetch(v_src_ptr + 2 * im_stride);
        __builtin_prefetch(v_src_ptr + 3 * im_stride);
        __builtin_prefetch(v_src_ptr + 4 * im_stride);
        __builtin_prefetch(v_src_ptr + 5 * im_stride);
        __builtin_prefetch(v_src_ptr + 6 * im_stride);
        __builtin_prefetch(v_src_ptr + 7 * im_stride);

        v_s = v_src_ptr;
        load_s16_8x8(v_s, im_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6, &s7);
        v_s += (7 * im_stride);

        d_u8 = dst_u8_ptr;
        height = h;

        do {
          s7 = vld1q_s16(v_s);
          v_s += im_stride;

          __builtin_prefetch(d_u8 + 0 * dst_stride);

          res0 = convolve8_vert_8x4_s32(s0, s1, s2, s3, s4, s5, s6, s7,
                                        y_filter, round_shift_vec, offset_const,
                                        sub_const_vec, vec_round_bits);

          vst1_u8(d_u8, res0);
          d_u8 += dst_stride;

          s0 = s1;
          s1 = s2;
          s2 = s3;
          s3 = s4;
          s4 = s5;
          s5 = s6;
          s6 = s7;
          height -= 1;
        } while (height > 0);
        v_src_ptr += 8;
        dst_u8_ptr += 8;
        w -= 8;
      } while (w > 0);
    }
  }
}
void av1_convolve_2d_copy_sr_neon(const uint8_t *src, int src_stride,
                                  uint8_t *dst, int dst_stride, int w, int h,
                                  const InterpFilterParams *filter_params_x,
                                  const InterpFilterParams *filter_params_y,
                                  const int subpel_x_qn, const int subpel_y_qn,
                                  ConvolveParams *conv_params) {
  (void)filter_params_x;
  (void)filter_params_y;
  (void)subpel_x_qn;
  (void)subpel_y_qn;
  (void)conv_params;

  const uint8_t *src1;
  uint8_t *dst1;
  int y;

  if (!(w & 0x0F)) {
    for (y = 0; y < h; ++y) {
      src1 = src;
      dst1 = dst;
      for (int x = 0; x < (w >> 4); ++x) {
        vst1q_u8(dst1, vld1q_u8(src1));
        src1 += 16;
        dst1 += 16;
      }
      src += src_stride;
      dst += dst_stride;
    }
  } else if (!(w & 0x07)) {
    for (y = 0; y < h; ++y) {
      vst1_u8(dst, vld1_u8(src));
      src += src_stride;
      dst += dst_stride;
    }
  } else if (!(w & 0x03)) {
    for (y = 0; y < h; ++y) {
      vst1_lane_u32((uint32_t *)(dst), vreinterpret_u32_u8(vld1_u8(src)), 0);
      src += src_stride;
      dst += dst_stride;
    }
  } else if (!(w & 0x01)) {
    for (y = 0; y < h; ++y) {
      vst1_lane_u16((uint16_t *)(dst), vreinterpret_u16_u8(vld1_u8(src)), 0);
      src += src_stride;
      dst += dst_stride;
    }
  }
}